Scilab 6.0.0
Ajuda do Scilab >> Processamento de Sinais > Transforms > ifftshift
ifftshift
inverse of fftshift
Syntax
y=ifftshift(x)
Arguments
- x, y
real or complex vector or matrix.
Description
ifftshift(x) swaps the left and right halves of the vector x.
For matrices, ifftshift(x) swaps the first quadrant with the third and the second quadrant with the fourth.
If x is a multidimensional array,
ifftshift(x) swaps "half-spaces" of x along each dimension.
Examples
Example #1:
// Make a signal t = 0:0.1:1000; x = 3*sin(t)+8*sin(3*t)+0.5*sin(5*t)+3*rand(t); // Compute the fft y = fft(x, -1); // Invert the result shift = fftshift(y); // Invert the inverted result invShift = ifftshift(shift); // Check that we recreated the original result and(y == invShift)
Example #2:
// Make a 2D image t = 0:0.1:30; x = 3*sin(t')*cos(2*t)+8*sin(3*t')*sin(5*t)+.. 0.5*sin(5*t')*sin(5*t)+3*rand(t')*rand(t); // Compute the fft y = fft(x,-1); // Invert the result shift = fftshift(y); // Invert the inverted result invShift = ifftshift(shift); // Check that we recreated the original result and(y == invShift)
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